Tube Rolling w/Crack

Hello,

Just completed my crack and its working well!

The tubes that were in the kit work very well....

On the small tube there is a very faint 12AU7 but no manufacturer id that can be actually read etc..

The power tube is a really big fat bottle type of old RCA tube. But I dont see anything on it that would tell me what it really is.

Is there anyway to tell from the pictures or the order what this tube is?

Thanks in advance!

Please note I am very happy with them!!!! Just wanted to know what they are for future ordering and tube hunting! (lol).

 

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Thanks!! for that 6AS7G.....awesome...I like its "shape" better than the straight bottles and I was indeed suprised when I saw it in the kit!! I hope I can find these somewhere!

Thanks Again!!

It is appreciated!
Alex
 
Holy crap Adydula bought a valve amp!  Welcome to the dark side :)

If you want to get all anorak about it you can look up the date codes on that tube too, http://pax-comm.com/rcadates.pdf  If i'm not mistaken BM = April 1967

If you post up some clear pics of the 12au7 somebody may be able to tell you exactly what that is too..
 
Hello!

Ha! Dark Side.... seeing how I just turned a young 66yrs old, I grew up with tubes and all there worst and went thru several tube amps in the last few years and none of them really stood out to me compared to other SS amps.

I guess I got bored and wanted to build something and the Beyer T90s have many people recommending this particular amp for their pairing.

Well sir I am really amazed at how good this amp works with my T90's....I have not heard anything better so far..its really a pleasure to listen and I am finding myself spending way too much time listening once again!

I found several 6AS7G tubes in EBay etc for approx.$25 - $50 etc....

Today I put the first coat of minwax on the case.....

I also experienced one of those tube worts... listening today I kept hearing a low high pitched hum / squeal and it was the power tube doing a resonance dance, a slight tap on the bottle and it went away.... and I am sure it will come and go... just one of the things I love about tubes!!! LOL.

Even with these minor idiosynchrocies....this amp is worth the end result.... just absolutely wonderful music!!

Even my old crappy bright Chicago cd's sound wonderful... Eva Cassidy is like unreal....

Nice to see you here!

Alex


 
Is 6520 the same tube with 5998? And how about Russian 6N13S/6H13C tube? Who know about this tube(6N13S/6H13C) sounding?
 
6520 is a 6AS7G variant with better specs, you can of course use them.  Some of them even have the same plate structure as a 5998.

6H13S is a very nice tube too, probably the best bang for your buck of them all.
 
Just got one- pretty inexpensive and in great shape. While I like the Tung Sol 5998 better, this is an easy tube to live with too-
 
I am a fairly new Crack builder/owner and have gone thru many amps, both SS and tubes..... the Crack is indeed a very special amp that really plays very well for me with a set of Beyer T90's. 250 Ohms.

I can't tell what the stock 12AU7 is, there aren't any discernible markings on it but it sounds really great to me. The power tube is the coke bottle RCA and I believe its a 6AS7G.

I bought a $12 12AU7 JJ Electronics from www.boiaudioworks.com this is a place I have bought several tubes from great to deal with and great shipping and the tubes have always come to me well packed and fast, I think there in Tempe AZ. (note I have NO vested interest in them just an FYI and another source for tubes).

I have only listened for a few hours with the JJ but its absolutely a stellar performer, I have a Salk Demo CD that has some really extreme and well mastered flacs and they sound just marvelous...

I would NOT hesitate to use a JJ 12AU7, only $12 for a matched triode tube!

Waiting on my speedball upgrade!

All the best
Alex
 
I looked at the 12AU7 that came with the crack, its has a 12AU7 in a octagon shaped label/box. Don't see any dots or anything else on the tube. On the bottom of the tube where the pins come out in the middle of the bottom glass inside the circular pins is the letter "N".

Does this mean anything, I assume this is a RCA tube, its not a clear top.

Alex
 
With a lot of american tubes that have 3digit codes, the first digit is the year, the following two digits are the week number which would imply 52nd week of 1953. But i may be wrong about that...
 
I think your correct. I got the orignal box it came it and it has a R-CB 16 and (1-49) on the top flap of the box where you open it up. This looks like the timeframe the carton was most likely made. It even smells like a 1950's box!!

I have an old Knight tube tester and it tested very well.

Been playing it for an hour seems ok fine for a good price compared to all the other high dollar stuff thats out there!

Alex
 
One of my 6AS7G tubes is very sensitive and emits a low buzz that I can detect easily. It goes thru several buzz's and wierd sounds while heating up...after 20-40 mins it seem to get better but any real movement or tapping on it you can hear the buzzing sound, its definitely in the tube....even tapping or moving my pc mouse around the amp causes it to hiccup at times!

I had the vendor send a replacement that is a 1948 JAN 6A7SG, that arrived today and I am listening to it at the moment and its like night and day stable and its perfectly quiet!!! Absolutley stunning!!

I called the vendor to see if they had anymore of the JAN tubes...for $15 its a real deal!

Alex
 
Hello all,

This is a bit of a stupid question that I am sure has been answered before many times.
Is it fine to drop a Tung-sol 5998 tube straight into a stock Bottlehead crack?
I am not sure if the first post covers the Crack without the Speed-ball upgrade.
Sorry for the stupid question, but I would appreciate a reply.
 
I just got a Thompson - CSF 6080WA made in france  from, parts connexion in Canada...

$11 with shipping to my door!! A great deal...

Is very solid and stable no bad tendenacies at all.

Not microphonic, no buzzing or wierd noises in the background...

It sounds like the other tubes to me.....no real difference.

Alex


 
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